| Draba muralis | GB, VC6 North Somerset, Easton-in-Gordano | John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 20/4/1935 | SLBI |
| Myriophyllum verticillatum | GB, VC30 Bedfordshire, Eaton Socon | John Frederick Gustav Chapple John Patrick Micklethwait Brenan | Druce Herbarium, Oxford | 11/8/1946 | SLBI |
| Potamogeton friesii x crispus = P. x lintonii | GB, VC16 West Kent, River Darent | John Patrick Micklethwait Brenan | Botanical Society & Exchange Club of The British Isles John Patrick Micklethwait Brenan | 17/9/1946 | SLBI |
| Potamogeton friesii x crispus = P. x lintonii | GB, VC16 West Kent, Riverhead | John Patrick Micklethwait Brenan | Job Edward Lousley | 17/9/1946 | SLBI |
| Potamogeton friesii x crispus = P. x lintonii | GB, VC16 West Kent, Riverhead | John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 17/9/1946 | SLBI |
| Ranunculus aquatilis | GB, VC23 Oxfordshire, Menmarsh | John Frederick Gustav Chapple John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 29/4/1937 | SLBI |
| Rubus lettii | IE, VCH38 Co. Down, Banbridge | John Patrick Micklethwait Brenan Norman Douglas Simpson | Norman Douglas Simpson | 1/8/1938 | SLBI |
| Rubus lettii | IE, VCH39 Co. Antrim, Crumlin | John Patrick Micklethwait Brenan Norman Douglas Simpson | Norman Douglas Simpson | 16/8/1939 | SLBI |
| Rubus pruinosus | IE, VCH39 Co. Antrim, Drumnadarragh | John Patrick Micklethwait Brenan Norman Douglas Simpson | | 17/8/1939 | SLBI |
| Rubus pruinosus | IE, VCH39 Co. Antrim, Drumnadarragh | John Patrick Micklethwait Brenan Norman Douglas Simpson | William Charles Richard Watson | 17/8/1939 | SLBI |
| Rumex crispus | GB, VC22 Berkshire, King's Weir | John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 11/7/1943 | SLBI |
| Aconitum napellus | GB, VC6 North Somerset, Stoke Lane | John Norton Mills John Patrick Micklethwait Brenan | John Norton Mills | 5/7/1944 | MANCH |
| Aconitum napellus | GB, VC6 North Somerset, Stoke Lane | John Norton Mills John Patrick Micklethwait Brenan | John Norton Mills | 5/7/1944 | MANCH |
+ | Bupleurum tenuissimum | GB, VC18 South Essex, Tilbury | John Norton Mills John Patrick Micklethwait Brenan | John Norton Mills | 2/9/1944 | MANCH |
+ | Bupleurum tenuissimum | GB, VC18 South Essex, Tilbury | John Norton Mills John Patrick Micklethwait Brenan | John Norton Mills | 2/9/1944 | MANCH |
+ | Bupleurum tenuissimum | GB, VC18 South Essex, Tilbury | John Norton Mills John Patrick Micklethwait Brenan | John Norton Mills | 2/9/1944 | MANCH |
| Carex montana | GB, VC6 North Somerset, Velvet Bottom | John Patrick Micklethwait Brenan | John Norton Mills | 23/4/1943 | MANCH |
+ | Cynodon dactylon | GB, VC1 West Cornwall, Penzance,Marazion | John Patrick Micklethwait Brenan N E G Cruttwell | John Norton Mills | 5/8/1943 | MANCH |
| Epipactis phyllanthes | GB, VC59 South Lancashire, Freshfield | John Patrick Micklethwait Brenan | John Norton Mills | 28/8/1959 | MANCH |
+ | Euphrasia anglica | GB, VC6 North Somerset | John Norton Mills John Patrick Micklethwait Brenan | John Norton Mills | 5/7/1944 | MANCH |
| Festuca pratensis x Lolium perenne = x Festulolium loliaceum | GB, VC34 West Gloucestershire, Bristol | John Norton Mills John Patrick Micklethwait Brenan | | 30/6/1941 | MANCH |
+ | Leucanthemum lacustre x maximum = L. x superbum | GB, VC59 South Lancashire, Birkdale | John Norton Mills John Patrick Micklethwait Brenan | John Norton Mills | 28/7/1959 | MANCH |
+ | Limonium binervosum subsp. anglicum | GB, VC28 West Norfolk, Holme-by-the-Sea | John Norton Mills John Patrick Micklethwait Brenan June R J Mills | John Norton Mills | 8/8/1946 | MANCH |
| Luzula forsteri x pilosa = L. x borreri | GB, VC24 Buckinghamshire, Marlow | John Norton Mills John Patrick Micklethwait Brenan | John Norton Mills | 7/6/1957 | MANCH |
+ | Melampyrum cristatum | GB, VC29 Cambridgeshire, Hardwick Wood | John Norton Mills John Patrick Micklethwait Brenan | John Norton Mills June R J Mills | 7/8/1946 | MANCH |
+ | Melampyrum cristatum | GB, VC29 Cambridgeshire, Hardwick Wood | John Norton Mills John Patrick Micklethwait Brenan | John Norton Mills June R J Mills | 7/8/1946 | MANCH |
+ | Melampyrum cristatum | GB, VC29 Cambridgeshire, Hardwick Wood | John Norton Mills John Patrick Micklethwait Brenan | John Norton Mills June R J Mills | 7/8/1946 | MANCH |
+ | Myriophyllum verticillatum | GB, VC30 Bedfordshire | John Norton Mills John Patrick Micklethwait Brenan | Botanical Exchange Club of The British Isles | 11/8/1906 | MANCH |
+ | Peucedanum palustre | GB, VC6 North Somerset, Shapwick | John Norton Mills John Patrick Micklethwait Brenan | John Norton Mills | 4/8/1944 | MANCH |
+ | Potamogeton compressus | GB, VC59 South Lancashire, Manchester,Droylsden | John Patrick Micklethwait Brenan | John Norton Mills | 27/7/1959 | MANCH |
| Potamogeton polygonifolius | GB, VC6 North Somerset, Shapwick | John Norton Mills John Patrick Micklethwait Brenan | John Norton Mills | 4/7/1944 | MANCH |
+ | Rumex sanguineus x pulcher = R. x mixtus | GB, VC29 Cambridgeshire, Cambridge | John Norton Mills John Patrick Micklethwait Brenan June R J Mills | John Norton Mills | 4/8/1946 | MANCH |
+ | Selinum carvifolia | GB, VC29 Cambridgeshire, Newmarket (N of),Chippenham | John Norton Mills John Patrick Micklethwait Brenan June R J Mills | John Norton Mills | 5/8/1946 | MANCH |
+ | Tordylium maximum | GB, VC18 South Essex, Tilbury | | John Norton Mills John Patrick Micklethwait Brenan | 27/7/1946 | MANCH |
+ | Valerianella dentata | GB, VC25 East Suffolk | J.N.M John Patrick Micklethwait Brenan June R J Mills | | 7/8/1846 | MANCH |
+ | Wahlenbergia hederacea | GB, VC3 South Devon, Chagford | John Patrick Micklethwait Brenan | John Norton Mills | 2/8/1941 | MANCH |
| Ballota nigra var. borealis | GB, VC41 Glamorganshire, Kenfig | John Patrick Micklethwait Brenan | | 13/9/1945 | K |
| Blysmus compressus | GB, VC6 North Somerset, Shepton Mallet | John Patrick Micklethwait Brenan Richard Alexander Fraser Brenan | | 12/6/1969 | K |
| Blysmus compressus | GB, VC20 Hertfordshire, Oughtonhead Common | John Patrick Micklethwait Brenan | | 26/6/1955 | K |
| Bupleurum tenuissimum | GB, VC11 South Hampshire, Hayling Island | John Patrick Micklethwait Brenan | | 1/10/1936 | K |